×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Compression only Springs

Compression only Springs

Compression only Springs

(OP)
I am trying to translate a long hand matrix analysis for a small portal frame , 2 columns , one beam across, into an excel/VBA. how could I model/include compression only spring for one of the column bases. that is if there is an upward load the spring wont be effective.

RE: Compression only Springs

Can you use the =IF function in Excel?  If this causes a self-referencing error, then you need 2 versions of the model -- one with the spring and one without.  Then use the =IF at the end to select the correct answer based on the status of the force at that location.

RE: Compression only Springs

If you want compression only springs you need to use an iterative process. And solve many consecutive matrixes.

You could set the springs as new members with a non-linear material with a normal young modulus in compression and a very small one for tension to avoid convergence problems.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources